Dissimilar metal flashing on metal roofing

I understand the general rule of not putting dis-similar metals together for corrosion/electrolyte problems but am confused regarding the aluminum vent stack flashing on stone-coated roofs for example.
Aluminum is very maleable, so can be bent around battens etc. but am wondering whether that can set up a corrosion problem if the bare side of the stone-coat shingle touches the aluminum.
Some "no-calk" pipe flashings with the rubber center have even been supplied with a stone-coat order from a distributor. So what's your opinion?
Dick in Washington

Share

Or copy this URL:
https://www.metalroofing.com/spirit/comment/8614/find/

Some stone-coat products may have a clear coat on their back side. I would inquire with the roofing manufacturer.
You could separate the two with a coat of paint or roofing mastic or sometimes with underlayment.

Share

Or copy this URL:
https://www.metalroofing.com/spirit/comment/8615/find/

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.